Dental mallet



(No Model.) Y

W. H DIBBLE. DENTAL MALLET.

No. 442,768. Patented Dec. 16. 1890.v

WIM/5885s ATTORNEYS PATENT Trice,

lVlLlllAM ll. DIBBLE, OF BROOKLYN, NEV YORK.

DENTAL MALLET.

SPECIFICATION forming part of Letters Patent No. 442,768, dated December16, 1890,

u Application tiled September 8, 1890. Serial No. 364,237. (No model.) Y

T0 a/ZZ whom, t 17m/y concern:

Be it known that I, WILLIAM Il. DIBBLE, of Brooklyn, in the county ofKings and State of New York, have invented a new and Improved DentalMallet, of which the following is a full, clear, and exact description.

My invention relates to improvements in that class of mallets which areused by dentists in filling teeth, and more especially to pneumaticdental mallets.

As heretofore constructed dental mallets have been provided with aplugger at one end only, and when a diiierent plugger is to be used theone in the handle has to be removed and replaced by the desired plugger.This causes considerable delay and annoyance, as it is often necessaryto do the work of filling very rapidly. Another objection to the commonform of mallet is that when worked pneumatically the motion of theplunger is imparted to the entire mallet instead of to the pluggeralone, and there is a loss ot motion, and consequently of eiiiciency.

The object of my invention is to obviate these difiiculties; and to thisend myinvention consists in a dental mallet having a plugger at eachend, and having means for delivering` a blow simultaneously on each plugger, so that one blow neutralizes the other. The handle remainsstationary, and the entire effective force of the stroke is imparted tothe pluggers.

Reference is to be had to the accompanying drawing, forming a part ofthis speciiicat-ion, in which the gure is a broken plan view of themallet and the pneumatic attachment for operating it, a portion of thelmallet being shown in longitudinal section.

The mallet has a central coupling A, through the center of which extendsa longitudinal bore a, the coupling being also provided with aradially-extending boss A', adapted to be coupled to the air-tube andhaving a bore a', which enters the central bore a and delivers air tothe same. The coupling has annular flanges a2 at each end,which carrythe plungercushions and which are internally screwthreaded to receivethe screw-threaded ends of the tubes B, which, together with thecoupling, form the handle of the mallet.

The pluggers O are held at each end of the mallet-that is,in the outerends ot' the tubes B e the pluggers being screwed into thethreadedsockets D, which are formed in the outer ends of the spindlesD', the inner ends of the spindles being formed into buttons D2 toreceive the blows of the plungers E. The spindles D move longitudinallyin the couplings d, by which they are united to the tubes B, and thespindles are normally pressed inward by spiral springs, so that whenforced out by the plungers they will immediately resume their normalposition. A rubber cushion c is interposed between the inner ends of thetubes B and the coupling A, the cushions serving the double purpose ofdeadening the sound of the plungers as they return after striking thebuttons D2 and ot' packing the joint between the tubes and coupling soas to make it air-tight.

I have not described in detail the construction and operation of thepluggers and the connections between the pluggers and tubes B as theyform no part of my invention and may be arranged in any of the usualways.

The plungers E are arranged on each end T ot the coupling A, so as toslide in the tubes B, and the outer ends ot the tubes are perforated,a-s shown, so that the air may escape at each stroke ot the plungers,thus overcoming the resistance which would otherwise take place.

A tube F, which is preferably of rubber, is coupled to the coupling-bossA', and connects with the bulb F', which is held in a ring G in theusual manner, so that it will lie upon the door in a stationary positionto enable it to be pressed by the foot.

rlhe mallet is provided with a plugger at each end, as described, andthese two pluggers are usually all that is necessary to till a tooth, sothat the dentist to change pluggers, instead of having to stop andunscrew one plugger and insert another in its place, merely turns hismallet end for end.

.The mallet operates substantially like the ordinary mallet. The dentistpresses with his toot on the bulb F', which forces the air lthrough thetube F and coupling A into the tubes B, thus forcing the plungers E tothe outer ends of the tubes B, so as to simultaneously strike thebuttons D2 and actuate the pluggers. lVhen the pressure is removed fromthe bulb, the air is withdrawn from the tubes B, the plungers E followthe air, being forced into the vacuum thus created, and theplugger-springs cause the pluggers to resume their normal position. Asthe plungers strike the opposite plugger-buttons at the same instant,there is no motion in the mallet-handle and the pluggers receive theWhole force of the blows delivered by the plungers, the amount of forcebeing in proportion to the pressure on the air-bulb.

I have shown and described a pneumatic mallet having a plugger at eachend; but it is obvious that other styles of Ina-Ilets may be providedwith pluggers at each end, and I therefore do not confine myself to theprecise form shown and described. Y

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. A dental mallet having a plugger at each end, andhaving means for simultaneously actuating the pluggers, substantially asde- 2 5 scribed.

2. A dental mallet having a spring-pressed plugger at each end and meansfor simultaneously striking the pluggers, substantially as described.

3. A dental mallet comprising a tubular handle with spring-pressedpluggers at each end, plungers adapted to slide in the handle, and anair-tube connecting centrally with the handle and at the opposite endwith the bulb, substantially as described.

4. The combination, with a mallet of the character described and the air-tube connected therewith, of the air-bulb coupled to the tube, and thering encircling the bulb, substantially as described.

5. A dental mallet comprising a central coupling having a longitudinalbore and a lateral bore connecting therewith, tubes connected with eachend of the coupling and provided at their outer ends with spring-pressedpluggers, plungers adapted to slidein the tubes and strike the pluggers,and an air-tube having one end connected with the lateral bore of thecoupling and the opposite end coupled to a bulb, substantially asdescribed.

WILLIAM H. DIBBLE.

Witnesses:

WARREN B. HUTCHINsoN, E. M. CLARK.

